Almost certainly not, no.
Regular expressions are generally used, in the context you're looking at, to check that a string matches a given format. If you know what your format should be well enough that you're writing a regular expression for it, there should be no reason why you can't generate your own test data easily enough.
[Edit - it appears there are a few examples around. But this does ignore the fact that, to test that your regex is correct, you must have written test data already. So you should already have your strings.]
